Battery-free smart key

Abstract

A battery-free smart key with infrared system (IR) comprises a receiving coil, a side controller, and an infrared data association (IRDA) communication transmitter (TX) module. The receiving coil is able to receive electromagnetic waves with a wireless power and a certification data transmitted from an outside system. The side controller is used for processing the certification data and distributing the wireless power transmitted from the receiving coil. The IRDA communication TX module is coupled to the side controller and is able to transmit an IRDA communication signal with at least one certain user information. When the security entry system receives the correct IRDA communication signal, a door or an entry system can be unlocked. A car entry with IR system combined therewith is also disclosed.

What is claimed is: 
     
         1 . A car entry with infrared system comprising:
 a car, comprising an infrared signal transmitter coupled to a transmitting coil for transmitting a electromagnetic waves and an infrared data association communication receiver module for receiving an infrared data association communication signal with at least one certain user information; and   a battery-free smart key, comprising an infrared signal receiver which is coupled to a receiving coil for receiving the electromagnetic waves and an infrared data association communication transmitter module for transmitting the infrared data association communication signal with the at least one certain user information.   
     
     
         2 . The car entry with infrared system according to  claim 1 , wherein the car comprises a primary side controller coupling to the transmitting coil, the primary side controller is able of controlling the electromagnetic waves to the infrared signal received device. 
     
     
         3 . The car entry with infrared system according to  claim 2 , wherein the car comprises an automotive battery for providing power to the primary side controller. 
     
     
         4 . The car entry with infrared system according to  claim 3 , wherein the primary side controller comprises a first safety control, a first transmission coupling to the first safety control, a first authentication coupling to the first transmission and an indicator coupling to the authentication. 
     
     
         5 . The car entry with infrared system according to  claim 4 , wherein the first safety control coupling to the first automotive battery for controlling the power distribution of the primary side controller. 
     
     
         6 . The car entry with infrared system according to  claim 4 , wherein the first authentication is used to control the indicator to transmit the electromagnetic waves. 
     
     
         7 . The car entry with infrared system according to  claim 1 , wherein the electromagnetic waves comprises a wireless power and a certification signal. 
     
     
         8 . The car entry with infrared system according to  claim 7 , wherein the battery-free smart key comprises a secondary side controller coupling to the receiving coil. 
     
     
         9 . The car entry with infrared system according to  claim 8 , wherein the secondary side controller comprises a second safety control, a second transmission coupled to the second safety control, a second authentication coupled to the second transmission and a DCDC convertor coupled to the second transmission. 
     
     
         10 . The car entry with infrared system according to  claim 9 , wherein the second safety control is used for controlling the power distribution of the secondary side controller from the wireless power. 
     
     
         11 . The car entry with infrared system according to  claim 10 , wherein the second authentication is used for certificating the certification signal from the infrared signal transmitter and through the DCDC convertor to control the infrared data association communication transmitter module. 
     
     
         12 . A security entry with infrared system comprising:
 an infrared signal transmitter, comprising a primary side controller and a transmitting coil coupled to the primary side controller for transmitting an electromagnetic waves, wherein the electromagnetic waves comprises a wireless power and a certification signal;   an infrared signal received device, comprising a secondary side controller and a receiving coil coupled to the secondary side controller for receiving the electromagnetic waves;   an infrared data association communication transmitter module, coupled to the secondary side controller for transmitting an infrared data association communication signal with at least one certain user information; and   an infrared data association communication receiver module, used for receiving the infrared data association communication signal from the infrared data association communication transmitter module.   
     
     
         13 . The security entry with infrared system according to  claim 12 , wherein the primary side controller comprises a first safety control, a first transmission coupling to the first safety control, a first authentication coupling to the first transmission and an indicator coupling to the authentication. 
     
     
         14 . The security entry with infrared system according to  claim 13 , wherein at least one battery is coupled to the first safety control for providing power. 
     
     
         15 . The security entry with infrared system according to  claim 12 , wherein the secondary side controller comprises a second safety control, a second transmission coupled to the second safety control, a second authentication coupled to the second transmission and a DCDC coupled to the second transmission. 
     
     
         16 . The security entry with infrared system according to  claim 15 , wherein the DCDC coupled to the infrared data association communication transmitter module. 
     
     
         17 . A method of unlocking doors of a car entry, comprising:
 transmitting electromagnetic waves with a wireless power from a transmitting coil of an infrared signal transmitter;   receiving the electromagnetic waves with a wireless power from the infrared signal transmitter by an infrared signal receiver;   activating an infrared data association communication transmitter module after the infrared signal receiver is powered through the wireless power, and transmitting the infrared data association communication signal with at least one certain user information through the infrared data association communication transmitter module;   receiving the infrared data association communication signal with the at least one certain user information from the infrared data association communication transmitter module; and   unlocking doors of the car entry when the at least one certain user information matches a stored user information inputted into a memory chip of the car entry.   
     
     
         18 . The method of  claim 18 , wherein the electromagnetic waves further comprise a certificate signal used for an authentication to certificate the certification signal to control the infrared data association communication transmitter module.